ﻻ يوجد ملخص باللغة العربية
We present LMT/AzTEC 1.1mm observations of $sim100$ luminous high-redshift dusty star-forming galaxy candidates from the $sim600,$sq.deg $Herschel$-ATLAS survey, selected on the basis of their SPIRE red far-infrared colours and with $S_{500murm m}=35-80$ mJy. With an effective $theta_{rm FWHM}approx9.5,$ arcsec angular resolution, our observations reveal that at least 9 per cent of the targets break into multiple systems with SNR $geq 4$ members. The fraction of multiple systems increases to $sim23,$ per cent (or more) if some non-detected targets are considered multiples, as suggested by the data. Combining the new AzTEC and deblended $Herschel$ photometry we derive photometric redshifts, IR luminosities, and star formation rates. While the median redshifts of the multiple and single systems are similar $(z_{rm med}approx3.6)$, the redshift distribution of the latter is skewed towards higher redshifts. Of the AzTEC sources $sim85,$ per cent lie at $z_{rm phot}>3$ while $sim33,$ per cent are at $z_{rm phot}>4$. This corresponds to a lower limit on the space density of ultra-red sources at $4<z<6$ of $sim3times10^{-7}, textrm{Mpc}^{-3}$ with a contribution to the obscured star-formation of $gtrsim 8times10^{-4}, textrm{M}_odot textrm{yr}^{-1} textrm{Mpc}^{-3}$. Some of the multiple systems have members with photometric redshifts consistent among them suggesting possible physical associations. Given their angular separations, these systems are most likely galaxy over-densities and/or early-stage pre-coalescence mergers. Finally, we present 3mm LMT/RSR spectroscopic redshifts of six red-$Herschel$ galaxies at $z_{rm spec}=3.85-6.03$, two of them (at $z sim 4.7$) representing new redshift confirmations. Here we release the AzTEC and deblended $Herschel$ photometry as well as catalogues of the most promising interacting systems and $z>4$ galaxies.
We present a 1.1~mm census of dense cores in the Mon~R2 Giant Molecular Cloud with the AzTEC instrument on the Large Millimeter Telescope (LMT). We detect 295 cores (209 starless, and 86 with protostars) in a two square degree shallow survey. We also
Measuring redshifted CO line emission is an unambiguous method for obtaining an accurate redshift and total cold gas content of optically faint, dusty starburst systems. Here, we report the first successful spectroscopic redshift determination of AzT
The largest Herschel extragalactic surveys, H-ATLAS and HerMES, have selected a sample of ultrared dusty, star-forming galaxies (DSFGs) with rising SPIRE flux densities ($S_{500} > S_{350} > S_{250}$; so-called 500 $mu$m-risers) as an efficient way f
The Herschel Multi-tiered Extragalactic Survey (HerMES) has identified large numbers of dusty star-forming galaxies (DSFGs) over a wide range in redshift. A detailed understanding of these DSFGs is hampered by the limited spatial resolution of Hersch
We present the results from a 1.1 mm imaging survey of the SSA22 field, known for having an overdensity of z=3.1 Lyman-alpha emitting galaxies (LAEs), taken with the AzTEC camera on the Atacama Submillimeter Telescope Experiment (ASTE). We imaged a 9